PURPOSE: To enable enjoying the music being played by all persons together by making an arrangement so that a display control part may display the words to promote a variety of operations selected at a touch-panel part on a display device.

CONSTITUTION: A display part 7 is divided into a touch-panel part and 2 display device 13, and controlled by a display control part 14. A plurality of selectors (F) to promote a variety of operations from the display control part 14 are displayed on the touch-panel part 12. A singer selects one selector (f) among a plurality of selectors (F) which are displayed on the touch-panel part 12, and display control is realized by the display control part 14, and the selected selector (f) is displayed on a plurality of display device 13 provided in the store. Not only the singer but also other persons can enjoy singing the selected music together by seeing the respective display devices 17 of the display part 7.